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当前位置: 首页 > 文章 > 几种合成铁锰铝氧化物对铜离子的吸附作用及其影响因素研究 农业环境科学学报 2008,27 (03) 107-113
Position: Home > Articles > Adsorption of Cu(Ⅱ) on Synthetic Fe,Mn,Al-Oxides Minerals and Its Influencing Factors Journal of Agro-Environment Science 2008,27 (03) 107-113

几种合成铁锰铝氧化物对铜离子的吸附作用及其影响因素研究

作  者：
王帅;张晋京;窦森;王玉军;谢忠雷
单  位：
吉林农业大学资源与环境学院;吉林大学环境与资源学院
关键词：
针铁矿;赤铁矿;δ-MnO2;三羟铝石;铜;吸附;影响因素
摘  要：
应用平衡吸附法,研究了在不同的pH、离子强度、温度、Cu2+浓度及接触时间条件下,针铁矿、赤铁矿、δ-MnO2和三羟铝石对Cu2+的吸附作用。结果表明,随pH升高,几种氧化物对Cu2+的吸附率增大;针铁矿、赤铁矿和三羟铝石对Cu2+的吸附边界pH分别为4、5和4,而δ-MnO2的吸附边界pH不明显;随离子强度增大,针铁矿和赤铁矿对Cu2+的吸附量增加,而δ-MnO2和三羟铝石则降低;随Cu2+浓度增加,几种氧化物对Cu2+的吸附量增加,Langmuir方程的拟合效果最好。表观热力学参数指出,几种氧化物对Cu2+的吸附是自发、吸热和混乱度增加的过程;几种氧化物对Cu2+的吸附动力学过程可划分为快速和慢速反应阶段,Elovich方程更适于描述针铁矿和δ-MnO2对Cu2+的吸附动力学过程,双常数和抛物线扩散方程更适于赤铁矿,而一级动力学方程更适于三羟铝石。活化能和活化热力学参数指出,δ-MnO2对Cu2+吸附所需能量少、容易达到有序态,吸附速率大;而赤铁矿对Cu2+吸附所需能量多、不易达到有序态,吸附速率小。几种氧化物对Cu2+吸附的强弱顺序通常为δ-MnO2>三羟铝石>针铁矿>赤铁矿。
译  名：
Adsorption of Cu(Ⅱ) on Synthetic Fe,Mn,Al-Oxides Minerals and Its Influencing Factors
作  者：
WANG Shuai1,ZHANG Jin-jing1,DOU Sen1,WANG Yu-jun1,XIE Zhong-lei2(1.College of Resources and Environmental Sciences,Jilin Agricultural University,Changchun 130118,China;2.College of Environment and Resources,Jilin University,Changchun 130026,China)
关键词：
goethite;hematite;δ-MnO2;bayerite;copper;adsorption;influencing factor
摘  要：
Adsorption processes of Cu2+ on synthetic goethite,hematite,δ-MnO2 and bayerite were studied by batch equilibrium at different pH,ionic strength,temperature,Cu2+ concentration and contact time.The results showed that the adsorption of Cu2+ increased with an increase of solution pH from 2 to 8.The threshold pH values of Cu2+ adsorption were 4,5 and 4 for goethite,hematite and bayerite respectively,but,it was not obvious for δ-MnO2.With an increase of ionic strength,the adsorption of Cu2+ increased on goethite and hematite while it decreased on δ-MnO2 and bayerite.The amount adsorbed increased with an increase of the Cu2+ concentration.The Langmuir model was better than the Freundlich and Temkin models for describing the Cu2+ adsorption isotherms.The adsorption processes of Cu2+ were spontaneous and endothermic with higher disorder.The adsorption of Cu2+ could be divided into two stages:rapid and slow adsorption,and the Elovich model can be used to describe the Cu2+ adsorption rate on goethite and δ-MnO2,the dual-constant and parabola model for hematite and the first-order kinetic model for bayerite respectively.The activation energy(E) and the activation thermodynamic parameters(ΔG#,ΔH#,ΔS#) indicated that Cu2+ adsorption had the least energy requirement and the highest adsorption rate on δ-MnO2,while the greatest energy requirement and the lowest adsorption rate were appeared on hematite.In general,the adsorption affinity of these oxides to Cu2+ were in order of δ-MnO2>bayerite>goethite>hematite.

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